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/sci/ - Science & Math

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1190778 No.1190778 [Reply] [Original]

Light has no mass.

Light is attracted by gravity to a black hole.

Gravity is a force between mass.

Which part is wrong?

Discuss.

>> No.1190790

>>1190774
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>> No.1190805

>>1190778
The light has no mass part is wrong.

>> No.1190806

First is wrong,
and also 'they see me trollin'.."

>> No.1190820

>>1190806
How can light have mass?

>> No.1190828

the particle part of light has mass

>> No.1190832

>>1190828
Explain please?

>> No.1190834

>>1190820
Wave/Particle duality.

Acts as both therefore has a momentum.

It can't be stopped so I dunno if it has rest mass but it has a momentum, and that can be shown by experiment.

>> No.1190835

>>1190828
>implying that you can separate the particle part from the wave part

>> No.1190843

>>1190820

Fucking kids asking silly questions...

>> No.1190844

>>1190820

They have 'relatvie' mass. Also, photons aren't affected by gravity. They just follow the null-geodesics.

>> No.1190846

>>1190834
It does not have rest mass only relativistic mass. If you want to learn more, read something about relativism/Einstein

>> No.1190847

Photons have mass.

/thread.

>> No.1190857

>>1190846
I have read bits and pieces I just don't get into it cause I suck dick at math and the like so to actually get the physics I'd have to give myself a crash course.

>> No.1190862

>>1190844

That's pretty much what gravity is in general relativity.

>> No.1190870

gravity is a force that bends spacetime, the deformation of spacetime causes objects to attract
that's why light can't escape from a black hole

>> No.1190871

>>1190857
Then I suggest you read a "for dummies" book about Einstein. They don't cover the math behind it but they explain the principles.

>> No.1190873

How can a black hole emit x-ray's if nothing can escape?

>> No.1190882

>>1190871
Yeah but that's the thing, I could learn relativity easy, it's just I detest math it's just too raw, I don't like it cause it feels abstract and unapplied where as physics on the other hand I can grasp quite well.

Just need to start pulling out my old books and reteach myself the symbols and base equations and I'll be jamming

>> No.1190890

>>1190873
black holes don't emit x-rays
they emit hawking radiation which is virtual particles that get separated on the event horizon

if they emit x-rays that because of the gasses that spin around the black hole but have not yet crossed the event horizon

>> No.1190898

>>1190873
Ergospheres of rotating black holes, it's like the twilight zone, weird shit happens there

>> No.1190920

>>1190778
Gravity is more than just a force between masses. Duh, thats the whole point of general relativity.

1.) Masses bend spacetime, create a curvature
2.) Light moves on a null-geodesic

Therefore, the presence of mass alters the trajectory of light.


Quite simple, isn't it?

>> No.1190927

MASS CURVES SPACETIME. SPACETIME.

Lrn2Einstein

>> No.1190926

>>1190920
No.

>> No.1190934

>>1190926
You don't know shit.

>> No.1190938

>>1190934
0^2 = 1

>> No.1190975

>>1190778
Light has energy, so it has mass, it has E/c^2 mass (duh). ALSO follows geodesics.

>> No.1190990

Am I the only fucking non sciencefag here who dowloads torrents of science shows like Cosmos?

Yes it's always fucking mentioned and I can see why now, youtube Carl Sagan and light, bet you find something awesome...

You're a nerd, think.

>> No.1190993

>>1190975
Please stop mixing up the terms "mass" (= rest mass) and "relativistic mass". Also, stop using relativistic mass altogher please, speak of momenta.

Sincerely,
Modern Physics

>> No.1190995

If light has mass, why doesn't it create a sonic boom?

>> No.1191010

infinitesimally small mass requires infinite mass to be observed

>> No.1191018
File: 37 KB, 237x141, 1272318908611.jpg [View same] [iqdb] [saucenao] [google]
1191018

>>1190995

>> No.1191037

EVERYTHING has mass.

First one is wrong.

>> No.1191050

>>1191037
Define mass.

>> No.1191065

>Gravity is a force between mass.

This is wrong. light has no mass.

>> No.1191077

>>1190993

This, right here. "Relativistic mass" is a fucking stupid concept, that never is needed. Stop using it.

>> No.1191085

How can you believe in black holes if it's a part of the general theory (read: guess) of relativity?

>> No.1191128

>>1190995
does make sense.... 0_o

>> No.1191139

>>1190882
Fool. Physics IS math.

>> No.1191165

>>1191139
I know but because physics is applied maths I can make more sense of it.

i can see how it works and what it works on but with maths its just numbers.

>> No.1191200

LIGHT HAS NO MASS MOTHERFUCKING IDIOTS

PHOTONS ARE PART OF THE GAUGE-BOSONS, DEFINED TO HAVE M=0
THAT ALSO RENDERS IT LORENTZ-INVARIANT.

YES I MAD